/*
 * Copyright 2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.social.canvas;

import java.util.List;

import javax.inject.Inject;

import org.springframework.social.RevokedAuthorizationException;
import org.springframework.social.facebook.api.Facebook;
import org.springframework.social.facebook.api.Reference;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * Simple little @Controller that invokes Facebook and renders the result.
 * The injected {@link Facebook} reference is configured with the required authorization credentials for the current user behind the scenes.
 * @author Keith Donald
 */
@Controller
public class HomeController {

	private final Facebook facebook;
	
	@Inject
	public HomeController(Facebook facebook) {
		this.facebook = facebook;
	}

	@RequestMapping(value = "/" /*, method = RequestMethod.GET*/) // FB wants the canvas page to take POST requests (?)
	public String home(Model model) {
		List<Reference> friends = facebook.friendOperations().getFriends();
		model.addAttribute("friends", friends);
		return "home";
	}
	
	@ExceptionHandler(RevokedAuthorizationException.class)
	public String handleException() {
		return "signin";
	}
	
}